Cleaning device for electrostatic dust collector discharge electrodes

ABSTRACT

DUST IS SHAKEN FROM THE DISCHARGE ELECTRODES IN AN ELECTROSTATIC DUST SEPARATOR BY MEANS OF HITTING AN ANVIL SECURED TO THE FRAMEWORK, FROM WHICH THE ELECTRODES ARE HUNG, WITH A FREELY FALLING HAMMER WHICH ALTERNATELY STRIKES A VERTICAL SIDE AND AN INCLINED SIDE OF THE ANGLES TO PRODUCE VIBRATIONS IN DIFFERENT DIRECTIONS AND INTENSITY.

March 16, 1971 w, STEUERNAGE; 3,570,217

CLEANING DEVICE FOR ELECTROSTATIC DUST COLLECTOR DISCHARGE ELECTRODESFiled July 8, 1969 2 Sheets-Sheet 1 In van [or Walter Stellar/703a!March 16, 1971 w. STEUERNAGEL 3,570,217

CLEANING DEVICE FOR ELECTROSTATIC DUST COLLECTOR DISCHARGE ELECTRODESFiled July 8, 1 969 2 Sheets-Sheet 2 INVENTOR Walter I fiteuem a galUnited States Patent US. Cl. 55-112 4 Claims ABSTRACT OF THE DISCLOSUREDustis shaken from the discharge electrodes in an electrostatic dustseparator by means of hitting an anvil secured to the framework, fromwhich the electrodes are hung, with a freely falling hammer whichalternately strikes a vertical side and an inclined side of the anglesto produce vibrations in different directions and intensity.

In electrostatic gas cleaning, the dust settles not only upon thecollecting electrodes provided for this purpose, but after some time thedischarge electrodes are also covered with dust. Therefore, it isnecessary within predetermined periods to remove the dust not only fromthe collecting electrodes but also from the discharge electrodes byvibration.

Among the various methods of cleaning the electrodes in most cases theshaking by rapping is preferred. German Pat. 406,451 describes forinstance the rapping of the electrodes of an electrostatic dustcollector by means of rappers which are actuated by electromagnets in apredetermined rhythm. German Pat. 561,511 discloses a falling hammerwhich knocks via a rod the subjacent electrodes. Special constructionshave been developed for discharge electrodes. Germany Pat. 1,001,671shows such a rapping device for discharge electrodes. In this case, theframework carrying the discharge electrodes is rapped periodically bymeans of falling hammers. German registered Design 1,964,221 shows anarrangement for the rapping of two discharge electrode frames by meansof falling hammers actuated by a cam shaft, in which the hammers arearranged between the two discharge electrode frames and are knockingagainst a rapping frame connected firmly to the discharge electrodeframes. Falling hammer constructions for the cleaning of electrodes aredisclosed in German registered Design 1,865,538 and for instance in theSwedish Pat. 163,339. Substantially in all such constructions rapping isexecuted in one direction, either vertically from above or from below asdescribed in the two German Pats. 406,451 and 561,511 and in German Pat.1,001,671, or laterally as disclosed in the German regis tered Designs1,964,221 and 1,865,538. In this the rapping energy should betransmitted most effectively to the discharge electrodes via thesupporting frames with as little energy loss as possible. Experience hasshown that good results could be obtained with rapping blows ofdifferent intensity. For instance German registered Design 1,865,- 538proposes first to have a hammer of low weight drop upon the anvil andsubsequently a hammer of greater weight. In this, however, the rappingenergy is transmitted in the same direction. Surprisingly it has beenfound that a good cleaning of the electrodes can be obtained by rap-3,570,217 Patented Mar. 16, 1971 ping for instance a discharge system indifferent directions.

The object of this invention is to produce a means for rapping anelectrode framework to obtain vibrations of different direction anddifferent intensity.

In general, these objects are obtained by constructing a device for thecleaning of discharge electrodes in electrostatic dust collectors byvibrating the electrode supporting framework by means of fallinghammers, the rapping blows being of different directions and ofdifferent intensity and exerted upon an anvil firmly connected to thesupporting framework and in which the anvil is rapped on two sides, theone side being vertical and the opposite side having an acute angle tothe vertical.

In a further development the falling hammer is movably mounted like apendulum above the anvil.

In this the falling hammers are actuated by semicircular driving plates,or by two-armed levers.

The means by which the objects of this invention are obtained aredescribed more fully with respect to the accompanying drawings, inwhich:

FIG. 1 is a front view of the device with the hammer shown in oneposition; and

FIG. 2 is a similar view with the hammer shown in a second position.

FIG. 3 is a side view of the device shown in FIG. 1;

FIG. 4 is a front view of the device with a two armed lever means.

The anvil 1 having a vertical side 1a and an inclined opposite side 1bis arranged on and firmly connected to the supporting framework 2carrying the electrodes, not shown, by means of intermediate rods 3.Above this is a rotatable rapping shaft 4 on which the hammer 5 isfreely swingable and being actuated by the semi-circular driving plate 6to give pendulum movement. This semicircular driving plate 6 or twoarmed lever means 6' are rigidly connected to the rapping shaft 4.Hammer 5 is lifted by the semi-circular movement of the means 6 or 6' inupright position as shown in dotted lines in FIGS. 1 and 2 and falls byits own weight onto the anvil 1. Thereafter hammer 5 is lifted bysemi-circular movement of means 6 or 6' in opposite direction and fallsonto the other side of the anvil 1. As the figures show, the hammer hitsthe left vertical side 1a of the anvil transmitting the rapping energyupon the supporting frame in a horizontal direction. Subsequently afterthe driving plate has lifted the hammer, it falls and hits the inclinedright side 1b of the anvil for vibrating the supporting frame at anangle of approximately 45. This device thus changes the transmittingangle of the rapping energy between two successive alternate blows whichin addition are of different intensity. The different intensity of thehammer blows is caused by the fact that in hitting the vertical side ofthe anvil a greater height of fall exists than it does when the hammerhits the inclined side. Furthermore, the different transmitting anglecauses an additional different distribution of the energy.

Having now described the means by which the objects of this inventionare obtained, I claim:

1. A vibrating device for cleaning dust from the discharge electrodes inan electrostatic dust collector comprising a framework for holding thedischarge electrodes, an anvil having one vertical side and an inclinedopposite side and being firmly connected to said framework, and fallinghammer means above said anvil for alternately rapping each side toproduce rapping blows of different 1,981,455 11/ 1934- Knight 55-112direction and intensity vibrating said framework. 2 2 473 7 193 Meston55 112 2. A device as in claim 1, said falllng hammer means 3,086,3414/1963 Brandt 55 3O0X havmg a pendulum movement.

3. A device as in claim 2, further comprising semi- 5 3427787 2/1969Huge 55 112 circular driving plate means for lifting said hammer means.FOREIGN PATENTS 4. A device as in claim 2, further comprising two-899,783 9/1964 France 55 112 armed lever means for lifting said hammermeans.

DENNIS E. TALBERT, IR., Primary Examiner References Cited 10 UNITEDSTATES PATENTS US. Cl. X.R.

809,348 1/1906 Weston 17 55-300; 173--99, 100

865,175 9/1907 Evans 173100

